I have the phone with 1.1.1 and use ieraser to downgrade the firmware and ibrickr 0.91 to downgrade to downgrade to 1.0.2 firmware. I used the Erica's unlocked utility. Later I have problem to access the tmobile tzone. Don't know why. I did a itune restore and ieraser and unlock again.

Now I end up with a corrrupted IMEI. I got the message of invalid SIM and I did the viriginize again but didn't help. Do I need to upgrade the phone to 1.1.1 and virginize again.

Right now I have the 1.0.2 with the 3.XX firmware but the IMEI is corrupted.
Anyone know how to fix this problem